I hear it rarely , but it doesnt bother me to much. it last for 3 seconds. I have to admit I dont usually have the windows down when I start my car. I dont want damage to happen in the future, I will have them look at it

what I am hearing is no where near that loud. Its like a clicking noise for 2-3 seconds then it stops. I will consult with the service rep. My guy is solid. If its not going to do dmage I would rather not to open up a new motor

they take off the timing chain and everything they change out a cam gear or something like that its takes a really long time more than 6 hours about 8 plus its pretty hard thing its a personal thing to have it done... its ok if you don't and most dealership would rather not do it because its hard to do and the mechanics don't like doing it cause they lose money they only get paid for 6 but it takes a longer. Its not a recall so if you complain about it they will end up doing it for you.

My 07 is in the shop for this warranty repair as I type this... the sound started up around 15K miles and I now have 34K on the car. We thought it was some sort of exhaust or heat shield rattle a while back, but now with this TSB and some history of this noise at the dealer on other IS350 and GS350 motors, they knew what it was right away.